Doctor Who: EVERY NuWho Villain And Monster Ranked Worst To Best

Appear in: The Girl in the Fireplace, Deep Breath.

What's a bunch of beautifully mechanised, fancily dressed repair droids to do when their spaceship, the SS Madame de Pompadour, is badly damaged and they don't have the essential parts to fix it? Well, harvest the body parts of the crew and amalgamate them into the ship's mechanics that's what. But realising it would take more than an eye here and a heart there, they ingeniously opened time windows to the 18th century and zoned in on Madame de Pompadour because, you know, they're the same and her "compatible" brain will fully restore the ship. That's robot logic for you. Nevertheless, there's something quite sad when one of the droids slowly winds down, bows its head then stops completely.

Another batch of them survived a crash-landing of their spaceship, the SS Marie Antoinette - sister ship of the Madame de Pompadour. We pick up the deadly droids' seemingly never-ending repair story in Series 8's opener, where they've been extracting the local people's skin and organs and used them to blend nicely into Victorian society. It's good to know that even by the 51st century we still haven't added robust failsafes to robots that stop them from harming humans.